Last updated ·Published ·By the WiserWork team
401(k) Contribution Calculator
Set your contribution percentage right: capture the full match, see the paycheck cost
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The 401(k) contribution percentage is the highest-leverage number in personal finance, because three multipliers stack on it: the employer match (free money at 50–100 cents per dollar), the tax deduction (Uncle Sam funds part of every contribution), and decades of compounding. This calculator makes the stack visible — showing what each percentage point actually costs your paycheck versus what lands in your account.
The Leverage, Illustrated
Default example: $85,000 salary, 8% contribution, 50% match up to 6%, 22% bracket. You contribute $6,800; the match adds $2,550; the tax break returns $1,496. Result: $9,350 invested for a take-home cost of $5,304 — $1.76 in the account per $1 of paycheck sacrifice. That ratio is why "can't afford to contribute" usually inverts to "can't afford not to."
Reading Your Match Formula
| Common formula | Meaning | Contribute at least |
|---|---|---|
| 50% up to 6% | 50¢ per $1 on your first 6% of salary | 6% |
| 100% up to 4% | Dollar-for-dollar on first 4% | 4% |
| 100% on 3% + 50% on next 2% | Tiered | 5% |
The calculator's note flags exactly when you're below full capture — the single most common retirement mistake in America (an estimated $24B/yr of unclaimed match). One subtlety worth checking with HR: vesting (match may be forfeited if you leave within 2–6 years) and true-up provisions (front-loading contributions can accidentally forfeit match in plans without one).
The 2026 Limits
- Employee deferral: $24,500 — plus an $8,000 catch-up at 50+ (and an enhanced $11,250 catch-up at ages 60–63).
- Combined (you + employer): $72,000.
- The match does not count against your $24,500 — a persistent myth this calculator's table settles.
The Standard Priority Order
- 401(k) to the full match — the guaranteed 50–100% return comes first, always.
- High-interest debt (anything above ~7–8% APR — see the Debt Payoff Calculator).
- HSA if eligible (triple tax advantage), then Roth/Traditional IRA for fund choice and fees.
- Back to the 401(k) toward the full $24,500.
- Taxable investing beyond that.
How to Use the Calculator
- Enter salary, your plan's match formula (HR portal or SPD), your bracket and age.
- Drag the slider — watch the note change from "leaving money" to "full match" to "limit reached."
- Set your real payroll percentage to at least the full-match point today; revisit with every raise (+1% per raise is the painless escalator).
Frequently Asked Questions
What percentage should I contribute?
Floor: whatever captures the full match. Healthy target: 15% of gross income including the match (the standard planners' benchmark). The calculator shows the paycheck cost of each point — most people are surprised how cheap the next 1% is after taxes.
Traditional or Roth 401(k) contributions?
Traditional deducts now (this calculator's math); Roth taxes now, withdraws tax-free later. Rule of thumb: higher bracket now than expected in retirement → Traditional; lower now (early career) → Roth. The Roth vs Traditional tool runs your numbers.
Does the employer match count toward my $24,500 limit?
No — your deferral limit is separate. Match counts only toward the combined $72,000 ceiling, which almost nobody hits without mega-backdoor strategies.
What if I can't afford the full match percentage?
Start where you can and automate +1% every raise — the escalator path reaches full match within a couple of years without a felt paycut. Check the calculator's true-cost line: after the tax break, 1% of salary costs ~0.78% of take-home in the 22% bracket.
What happens to the match if I leave my job?
Your contributions are always yours; the match follows the vesting schedule (immediate to 6-year graded). Check yours before quitting weeks short of a vesting cliff — people forfeit thousands doing exactly that.
Should I front-load contributions early in the year?
Only if your plan has a true-up provision — otherwise maxing out by September can forfeit the match on the paychecks where you contribute nothing. Ask HR the one-word question: 'true-up?'
Is my information private?
Yes — salary and plan details never leave your browser.
Set the percentage once, automate the escalator, and this becomes the rare financial decision that keeps paying without maintenance. The slider's verdict — full match captured — is worth more than almost any investment-picking you'll ever do.